package com.itcam.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;

/**
 * @author : Cammy.Wu
 * Description : 消费者
 */

public class ConsumerQuickStart {
    private static final Logger log = LoggerFactory.getLogger(ConsumerQuickStart.class);

    public static void main(String[] args) {
        // 1.设置kafka的配置信息
        Properties prop = new Properties();
        // 连接信息
        prop.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.200.130:9092");
        // 指定消费者组
        prop.put(ConsumerConfig.GROUP_ID_CONFIG, "group001");
        // 反序列化的key和value
        prop.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        prop.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");

        // 手动提交偏移量
        prop.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);

        // 2.创建消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(prop);

        // 3.订阅主题
        consumer.subscribe(Collections.singleton("topic_first"));

        // 4.获取消息
        // while (true) {
        //     ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
        //     for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
        //         System.out.println(consumerRecord.key());
        //         System.out.println(consumerRecord.value());
        //         System.out.println(consumerRecord.partition());
        //         System.out.println(consumerRecord.offset());

                /*try {
                    // 同步提交偏移量
                    consumer.commitSync();
                } catch (CommitFailedException e) {
                    log.error("记录提交失败的异常:{}", e);
                }*/
        //     }

        // 异步的方式提交偏移量
            /*consumer.commitAsync(new OffsetCommitCallback() {
                @Override
                public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
                    if (null != e) {
                        System.out.println("记录提交失败的异常" + map + ",异常信息为：" + e);
                    }
                }
            });*/

        // }

        // 同步和异步组合提交偏移量
        try {
            while (true) {
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println(consumerRecord.key());
                    System.out.println(consumerRecord.value());
                    System.out.println(consumerRecord.partition());
                    System.out.println(consumerRecord.offset());
                }

                // 异步提交偏移量
                consumer.commitAsync();
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("记录提交失败的异常" + e);
        }finally {
            // 同步提交偏移量
            consumer.commitSync();
        }

    }


}
